查询Oracle中带有Clob字段的表的大小

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在oracle里面，由于lob字段有独立的lob segment来存储，所以查询需要DBA_SEGMENTS S, DBA_INDEXES  2张表结合才可查出结果。

以下是实验SQL说明：

表名：GJ_NORM_POOL

表归属用户名：ORACLE

SELECT  
 (SELECT NVL(SUM(S.BYTES),0)                                                                                               -- The Table Segment size  
  FROM DBA_SEGMENTS S  
  WHERE S.OWNER = UPPER('ORACLE') AND  
       (S.SEGMENT_NAME = UPPER('GJ_NORM_POOL'))) +  
 (SELECT NVL(SUM(S.BYTES),0)                                                                                               -- The Lob Segment Size  
  FROM DBA_SEGMENTS S, DBA_LOBS L  
  WHERE S.OWNER = UPPER('ORACLE') AND  
       (L.SEGMENT_NAME = S.SEGMENT_NAME AND L.TABLE_NAME = UPPER('GJ_NORM_POOL') AND L.OWNER = UPPER('ORACLE'))) +  
 (SELECT NVL(SUM(S.BYTES),0)                                                                                               -- The Lob Index size  
  FROM DBA_SEGMENTS S, DBA_INDEXES I  
  WHERE S.OWNER = UPPER('ORACLE') AND  
       (I.INDEX_NAME = S.SEGMENT_NAME AND I.TABLE_NAME = UPPER('GJ_NORM_POOL') AND INDEX_TYPE = 'CLOB' AND I.OWNER = UPPER('ORACLE')))  
  "TOTAL TABLE SIZE"  
FROM DUAL;  

TOTAL TABLE SIZE
13500416

select 13500416/1024/1024/1024 from dual;  

0.0125732421875
总结：oracle用户下的拥有CLOB字段的表GJ_NORM_POOL总大小为 0.0125732421875G.